Juicy 77 is the outcome of a research project which aims to investigate state of the art methodologies for mathematical modeling and numerical simulation of analog signal processing equipment. Its preamplifier section is inspired from an early 90's rack mount preamplifier manufactured by a legendary amplifier manufacturer located in the northwestern USA. The power amplifier section simulates standard pentode powered push-pull output stages. The loudspeaker cabinet simulator section includes seven classical cabinet types.